In photovoltaic power generation, photovoltaic inverter is the core component of the whole photovoltaic power generation, and MPPT is the very core technology of photovoltaic inverter in photovoltaic inverter, so what is MPPT exactly? Let's get to know each other!
MPPT controller full name "Maximum Power Point Tracking" (Maximum Power Point Tracking) solar controller, is the traditional solar charging and discharging controller upgrade products. MPPT controller can detect the generation voltage of solar panel in real time and track the highest voltage current value (VI), so that the system can charge the battery with the maximum power output. Applied in solar photovoltaic system, coordinating the work of solar panel, battery and load is the brain of photovoltaic system.
Maximum power point tracking system is a kind of by adjusting the working state of the electrical module, photovoltaic panels can output more power electrical system to be able to direct current (dc) from the solar panels effectively stored in the battery, can effectively solve the regular power grid can't cover in the remote areas and tourist areas of life and industrial electricity, do not produce environmental pollution.
What is the role of MPPT?
Due to the influence of external factors such as light intensity and environment, the output power of solar cells is variable, and the light intensity generates more electricity. The inverter with MPPT maximum power tracking is to make full use of solar cells and make them run at the maximum power point. That is to say, in the case of constant solar radiation, the output power of MPPT will be higher than that of MPPT, which is the role of MPPT.
Principle of maximum power point tracking
With the development of electronic technology, MPPT control of current solar arrays is generally accomplished by DC/DC conversion circuit. The schematic block diagram is shown in the following figure.
The photovoltaic cell array is connected to the load through the DC/DC circuit. The maximum power tracking device continuously detects the current and voltage changes of the photovoltaic array and adjusts the duty cycle of the PWM drive signal of the DC/DC converter according to the changes.
MPPT system principle block diagram
For linear circuits, the power supply has a maximum power output when the load resistance is equal to the internal resistance of the power supply. Although both photovoltaic cells and DC/DC conversion circuits are strongly nonlinear, in a very short period of time they can be considered linear. Therefore, as long as the equivalent resistance of the dc-dc conversion circuit is adjusted so that it is always equal to the internal resistance of the photovoltaic cell, the maximum output of the photovoltaic cell can be achieved, and the MPPT of the photovoltaic cell can be achieved.
This article is provided by shenzhen guruiwatt new energy co., LTD. Founded in May 2010, shenzhen gurui watt new energy co., ltd. is a national high-tech enterprise specialized in providing solutions for photovoltaic inverters, photovoltaic energy storage systems and intelligent energy management systems on the user side.